CVE-2021-43940

Name: CVE-2021-43940
Creator: NVD / NIST
Published: 2022-02-15T04:15:07.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2021-43940 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Affected versions of Atlassian Confluence Server and Data Center allow authenticated local attackers to achieve elevated privileges on the local system via a DLL Hijacking vulnerability in the Confluence installer. This vulnerability only affects installations of Confluence Server and Data Center on Windows. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

Affected versions of Atlassian Confluence Server and Data Center allow authenticated local attackers to achieve elevated privileges on the local system via a DLL Hijacking vulnerability in the Confluence installer. This vulnerability only affects installations of Confluence Server and Data Center on Windows. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.33%

24.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Atlassian	Confluence Data Center	< 7.4.10
Atlassian	Confluence Data Center	>= 7.5.0, < 7.12.3
Atlassian	Confluence Server	< 7.4.10
Atlassian	Confluence Server	>= 7.5.0, < 7.12.3

References

https://jira.atlassian.com/browse/CONFSERVER-66550Issue Tracking, Vendor Advisory
https://jira.atlassian.com/browse/CONFSERVER-66550Issue Tracking, Vendor Advisory

Timeline

Published: Feb 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43940?

How severe is CVE-2021-43940?

CVE-2021-43940 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43940?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43940?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST